i dont know that i would use well water? you can pick up salt from the lfs there is a few different types and you just mix it with your water. you might want to buy some r/o water from the lfs store. sometimes well water can cause problems even after adding your tap water conditioner to the water. but its your choice you could test the water afterwards and see what the paramaters are to make sure the well water is ok for your tank.

reverse osmosis, its a machine that filters the water till all thats left is clean clear water, basicly it takes out 99.9% or so i think of chlorine,chloramine etc, and its much cheaper to buy salt and mix it with water at home

I live in FL. and have well water! I wouldn't even drink that stuff myself ... ... so I definitely wouldn't put it in an aquarium! I don't know how the well water is in Illinois, but here in FL the well water is very hard and full of traces of limestone.

When I first got my dog, I tried giving the water to her and she looked at me like how dare you! HaHa ... now she gets strictly Zephyrhills Bottled water, what a queen !!!!

__________________
God grant me the serenity to accept the thing's I can not change, the courage to change the thing's I can and the wisdom to know the difference!

i would just take the water to your lfs if you have one you can trust and let them test it and give you advice on using it. everyones well water will be different. like jermz79 said there can be elements that will cause you problems possibly. however if you filter you tap water with several good filter that remove this before it reachs your tap then i would not see any problems. just use caution you dont want to buy expensive livestock and have you tank crash becuase of elements eventually build up in your tank and cause problems. so it basically depends on what you want to try and use and see what happens.